Some were allegedly found with their hands tied and stripped of their clothes, spokeswoman Ravina Shamdasani said
The global death toll is at least 733,000 since the novel coronavirus emerged in China last December, according to a running tally from official sources compiled by AFP.
The global tally crossed 20 million cases on Monday - probably reflecting only a fraction of the actual number of infections.
As around much of the globe, the small African country of Malawi on Sunday imposed tight social restrictions to try to contain the disease, shutting all bars and churches, while hot weekend weather drew crowds in Europe to the beach.
"It shouldn't have gotten this bad," he said.
The US on Sunday had added 47,197 new cases in 24 hours, with 532 additional deaths, according to Johns Hopkins University.
US fatalities now total 162,913, and the number of infections is 5,041,473, the Baltimore-based university said.
Elsewhere, growing infections in and around Paris prompted French officials to make face masks compulsory outdoors in crowded areas and tourist hotspots in the city and surrounding areas from Monday.
The mask will be obligatory for all those aged 11 and over in "very crowded zones," said a police statement, including the banks of the Seine River and more than 100 streets in the French capital.
As temperatures soared across western Europe, holidaymakers crowded beaches at the weekend despite warnings about the risk of infection.
Local authorities in Germany warned that some beaches and lakes would be closed if there were too many people.
Belgian police meanwhile arrested several people Saturday at the resort of Blankenberge after a brawl broke out on a beach between officers and youths they had told to leave for refusing to respect virus safety measures.
Around 5,000 people demonstrated in Vienna for increased financial support for nightlife and relaxing coronavirus regulations.
In Peru, indigenous people armed with spears and angry over what they consider government neglect of their communities in the pandemic assaulted a settlement for oil workers deep in the Amazon, triggering a clash with police that left three natives dead, the government said Sunday.
Back in the US, in another burst of defiance over health warnings, thousands of bikers converged on a town in South Dakota for what is billed as the largest cycle gathering in the world.
In past years, the 10-day rally in Sturgis has drawn hundreds of thousands of bikers to socialize, drink and party together - raising fears among some locals that this year's version could be a superspreader event.
Some were allegedly found with their hands tied and stripped of their clothes, spokeswoman Ravina Shamdasani said
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